* {
  margin: 0;
  padding: 0;
}
.w,
.top-bar,
.banner,
.menu,
.course-list {
  width: 17.325rem;
  margin: 0 auto;
}
html {
  font-size: 5.33333333vw;
  background-color: #eff0f4;
}
a {
  text-decoration: none;
}
.top-bar {
  display: flex;
  height: 4.375rem;
  line-height: 4.375rem;
  justify-content: space-between;
  align-items: center;
}
.top-bar a {
  color: #24253d;
  font-size: 1.25rem;
}
.top-bar a i {
  color: #999;
  font-size: 1rem;
}
.banner img {
  width: 100%;
}
.menu {
  height: 8.225rem;
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
  align-content: space-evenly;
}
.menu a {
  width: 8.175rem;
  height: 2.6rem;
  line-height: 2.6rem;
  color: white;
  border-radius: 0.25rem;
}
.menu a i {
  margin: 0 0.5rem 0 0.95rem;
}
.menu .course {
  background-color: #f97053;
}
.menu .star {
  background-color: #cd6efe;
}
.menu .sub {
  background-color: #fe4479;
}
.menu .download {
  background-color: #1bc4fb;
}
.course-list {
  height: 9.85rem;
  display: flex;
  flex-flow: column;
  justify-content: space-between;
  margin-bottom: 1.15rem;
}
.course-list .title {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.course-list .title h2 {
  font-size: 0.825rem;
  color: #24253d;
  border-left: 2px solid #3a84ff;
  padding-left: 4px;
}
.course-list .title a {
  font-size: 0.7rem;
  color: #656565;
}
.item-list {
  width: 18rem;
  display: flex;
  overflow: auto;
}
.item {
  flex: none;
  box-sizing: border-box;
  width: 8rem;
  height: 8.1rem;
  padding: 0 0.55rem;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  border-radius: 5px;
  display: flex;
  flex-flow: column;
  justify-content: space-evenly;
  margin-right: 0.6rem;
}
.item img {
  width: 100%;
  vertical-align: top;
}
.item .course-title {
  font-size: 0.8rem;
  color: #24253d;
}
.item .user-info {
  display: flex;
  align-items: center;
}
.item .avatar {
  width: 1.05rem;
  height: 1.05rem;
}
.item .nickname {
  margin-left: 6px;
  font-size: 0.6rem;
  color: #969393;
}
